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| specification FM7843 touch screen controller ver 1.0 1 FM7843 touch screen controller specification oct. 2007
specification FM7843 touch screen controller ver1.0 2 information in this document is intended as a refere nce to assist our customers in the selection of shanghai fudan microelectronics co., ltd product best suited to the customer's application; they do not convey any license under any intellectual property rights, or any other rights, belonging to shanghai fudan microelectronics co., ltd or a thir d party. when using the information contained in this documents, please be sure to evaluate all information as a total system before making a final decision on the applicability of the information and products. shanghai fudan microelectronics co., ltd assumes no responsibility for any damage, liability or other loss resulting from the information contained herein. shanghai fudan microelectronics co., ltd products are not intended for use in medical, life saving, or life sust aining applications. the prior written approval of shanghai fudan microelectronics co., ltd is necessary to reprint or reproduce in whole or in part these documents. future routine revisions will occur when appropriate, without notice. contact shanghai fudan microelectronics co., ltd sales of fice to obtain the latest specificat ions and before placing your product order. please also pay attention to information published by shanghai fudan microelectronics co., ltd by various means, in cluding shanghai fudan microelectronics co., ltd home page (http://www.fmsh.com/ ). please contact shanghai fudan microelectronics co., ltd local sales office for the specification r egarding the information in t his documents or shanghai fudan microelectronics co., ltd products. trademarks shanghai fudan microelectronics co., ltd name and logo, the logo are trademarks or registered trademarks of shanghai fudan microelectronics co., ltd or its subsidiaries in china . shanghai fudan microelectronics co., ltd, printed in the china, all rights reserved. specification FM7843 touch screen controller ver1.0 3 product overview instruction FM7843 is a 4-wire resistive touch screen input controller integrated circuit. the device is a 12-bit analog-to-digital converter with a synchronous se rial interface and touch screen driving circuit. it has a shutdown mode, in which the power dissipati on of the device is as low as 0.5w. fully compatible with burr-brown? ads7843, this device is ideal to be used in personal digital assistant (pda) and portable instruments applications. features ? realizing the driver selection of touch screen ? analog-to-digital conversion on input voltage or auxiliary voltage ? synchronous serial interface ? up to 125khz conversion rate ? programmable 8-bit or 12-bit resolution ? single supply: 2.7v to 5v ? 2 auxiliary analog inputs block diagram specification FM7843 touch screen controller ver1.0 4 pin assignment pin description symbol pin function vcc 1 power supply 2.7v to 5v x+ 2 x+ position input. adc input channel 1 y+ 3 y+ position input. adc input channel 2 x- 4 x- position input y- 5 y- position input gnd 6 ground in3 7 auxiliary input 1. adc input channel 3 in4 8 auxiliary input 2. adc input channel 4 vref 9 voltage reference input vcc 10 power supply, 2.7v to 5v penirq 11 pen interrupt. open anode output (requires 10k ? pull-up resistor externally). dout 12 serial data output. data is shifted on the falling edge of cs dclk. this output is high impedance when cs is high busy 13 busy output. this output is high impedance when cs is high din 14 serial data input. if cs is low, data is latched on rising edge of dclk. cs 15 chip select input, conversion timing a nd enables the serial input/output register. dclk 16 external clock input. this clock runs the sar conversion process and synchronizes serial data i/o. specification FM7843 touch screen controller ver1.0 5 characteristics absolute maximum ratings symbol parameter min max unit v cc maximum operation voltage -0.3 6 v v ia analog input voltage -0.3 vcc+0.3 v v id digital input voltage -0.3 vcc+0.3 v p tot total power dissipation 250 mw t stg storage temperature -55 +150 t opr operation temperature -40 +85 electrical characteristic v cc =2.7v, v ref =2.5v, f sample =125khz, f clk =2mhz parameter min typ max unit absolute input range -0.2 vcc + 0.2 v capacitance 2.5 pf analog input leakage current 0.1 a resolution 12 bits no missing codes 11 bits integral linearity error 2 lsb offset error 6 lsb gain error 4 lsb system performance power supply rejection 70 db conversion time 12 clk cycles acquisition time 3 clk cycles sampling dynamics throughput rate 125 khz switch drivers on-resistance 5 ? quiescent current 280 650 a shut down mode 3 a power supply requirements power dissipation 1.8 mw specification FM7843 touch screen controller ver1.0 6 application example specification FM7843 touch screen controller ver1.0 7 ordering information ordering code package operation temperature FM7843-ts tssop16 FM7843-qf qfn16 industrial temperature -40c ~ +85c specification FM7843 touch screen controller ver1.0 8 package dimensions tssop16 specification FM7843 touch screen controller ver1.0 9 qfn16 specification FM7843 touch screen controller ver1.0 10 revision history version publication date pages paragraph or illustration revise description 1.0 oct. 2007 11 initial release. specification FM7843 touch screen controller ver1.0 11 sales and service shanghai fudan microelectronics co., ltd. address: bldg no. 4, 127 guotai rd, shanghai city china. postcode: 200433 tel: (86-21) 6565 5050 fax: (86-21) 6565 9115 shanghai fudan microelectronics (hk) co., ltd. address: flat 12, 7/f, east ocean centre, 98 granville rd, tsimshatsui east, kowloon, hong kong. tel: (852) 2116 3288 2116 3338 fax: (852) 2116 0882 beijing office address: room.1208, bldg c, zhongguancun science and technolog y development edifice, 34 zhongguancun street (south), haidian district, beijing city, china. tel: (86-10) 6212 0682 6213 9558 fax: (86-10) 6212 0681 shenzhen office address: room.1301, century bldg, shengtingyuan hotel, huaqiang rd (north), shenzhen city, china. postcode: 518028 tel: (86-755) 8335 3211 8335 6511 fax: (86-755) 8335 9011 web site: http://www.fmsh.com/ |
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